Supercritical　water　circulating　fluidized　bed　coal　gasification　is　a　new　promising　technology　with　efficient　and　clean　utilization　of　coal.　A　thorough　understanding　of　flow　characteristics　is　the　basis　for　rational　design　of　reactor.　In　this　paper,　a　three-dimensional　full-loop　simulation　of　supercritical　water　circulating　fluidized　bed　is　conducted　based　on　multi-phase　particle-in-cell　(MPPIC)　method　coupled　with　an　energy-minimization　multi-scale　(EMMS)　model.　And　the　effects　of　operating　parameters,　such　as　temperature,　initial　solid　inventory　and　fluidized　gas　velocity　in　the　riser　on　the　flow　characteristics,　such　as　solid　mass　flux,　pressure　drop　in　the　riser　and　time　averaged　radial　voidage　distribution,　are　studied.　Which　is　of　great　importance　for　the　design　and　optimization　of　supercritical　water　circulating　fluidized　bed　reactor.　©　2022,　Science　Press.　All　right　reserved.